Carbohydrate
Hydrolysis of lactose yields

glucose and fructose
galactose and fructose
fructose and galactose
galactose and glucose

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Carbohydrate
The multistep pathways of metabolism are efficient because they

use the same substrate for all of the enzymes in the pathway
use the same enzyme for all of the substrates in the pathway
locate all of the enzymes for a pathway in the same place within the cell
spread the enzymes for a pathway into several different organelles

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